div {
    box-sizing: border-box;
}

body {
    background-color: rgb(231, 245, 235);
}

.back {
    position: absolute;
    right: 50px;
    top: 20px;
    padding: 10px;
    background-color: #4CAF50;
    border-radius: 20%;
    color: white;
    border: none;
}

.back:hover, dd:hover {
    cursor: pointer;
    color: red;
    font-weight: bold;
}

dd {
    text-align: left;
    float: left;
    width: 340px;
    height: 30px;
    font-size: 14px;
}

#intro {
    position: absolute;
    top: 60px;
    left: 27px;
    width: 670px;
    height: 204px;
    border: 2px solid #cfb53b;
}

#intro img {
    position: absolute;
    top: 0px;
    left: 0px;
    height: 200px;
    width: 150px;
}

#intro div {
    position: absolute;
    bottom: 0px;
    right: 0px;
    height: 100px;
    width: 500px;
    font-size: 15px;
}

.bookname {
    font-size: 30px;
    font-family: 楷体;
    font-weight: bold;
    position: absolute;
    left: 350px;
    top: 20px;
}

.author {
    font-size: 12px;
    position: absolute;
    left: 360px;
    top: 60px;
}

#cata {
    margin-left: 20px;
    position: absolute;
    top: 300px;
}

dd{
    margin-left: 20px;
    padding: 0 0;
    color: rgb(68, 123, 103);
    font-family: 宋体;
}
dd b{
    color: rgb(51, 128, 100);
}